**Colloquium: Thursday, May 6th, 4:25 PM, Via Zoom**** **

**"****Fun with Spins: From Haldane Chains to Quantum Spin Liquids in Spin-1 Magnets****" -**** ****Prof. ****Andriy Nevidomskyy****, ****Rice University****. **

It has long been realized that the presence of magnetic frustration – the impossibility to simultaneously minimize competing terms in the energy functional – often serves as a catalyst for the formation of novel phases of matter such as the quantum spin liquids, in which long-range magnetic order has been destroyed by strong quantum fluctuations. While geometric frustration in spin-1/2 magnets has received much theoretical and experimental attention, the behaviour of spin-1 counterparts remains less explored. I shall begin by reviewing the properties of 1D spin-1 magnets, culminating with the discussion of the celebrated Haldane conjecture. We shall then continue on a journey of exploring the very interesting properties of frustrated spin-1 magnets in higher dimensions, summarizing what is known to date, complemented with the recent results of my own obtained using a combination of various analytical and numerical techniques. In particular, the possibility of quantum spin liquids and other competing quantum states in spin-1 systems will be discussed, with an outlook for materials where such behaviour may be found experimentally.

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Physics and Astronomy Colloquia are usually scheduled for Thursdays at 4:25 PM via Zoom.If you would like to attend from outside Lehigh, please contact Prof. B. Roy (bir218@lehigh.edu) for the passcode to the meeting

**Physics Colloquium Schedule for Fall 2020**

**Click on Title below for past or upcoming Announcements (where available), and Speaker name for website. ** ** **